Science and technology news

Aeroponics to boost NY potato production

Posted onDecember 20, 2013

The mashed potatoes or latkes that enhance your holiday feast have taken a long path from tuber to table – in many cases, several years.

A project at Cornell University could trim that time and aid farmers by boosting production in a more efficient, sustainable way. It could also speed up introduction of new disease-resistant varieties to market and ensure that consumers continue to count on locally grown potatoes for years to come.

Mini tubers growing along suspended stems as part of an experiment in aeroponic potato production at Cornell’s Uihlein Farm in Lake Placid. Credit: Keith Perry

For the past three years, Keith Perry, associate professor of plant pathology and plant-microbe biology and director of the New York State Foundation Seed Potato Program and the Uihlein Farm in Lake Placid, N.Y., has been working with farm manager Chris Nobles on a novel “aeroponics” system that shows great promise for enhancing potato propagation in New York.

Locally grown potatoes rely on the efforts of plant pathologists and breeders at Cornell, who have been battling the destructive golden nematode pest since it first appeared in New York soils in 1941 (see sidebar). But to maintain a statewide stock of pathogen-free potatoes for farmers to plant, they must first follow a long process of propagation that begins in the lab.

To prevent plant disease, New York potatoes are grown from tubers, not seeds. “Seed potato” production begins from sprouts grown in test tube cultures. Tiny plantlets are transferred to greenhouses once they are tested to be free of pathogens. In the first year, they are raised in pots of peat moss to produce “mini tubers,” which are grown in fields at the isolated 565-acre Uihlein Farm in two successive years before being passed on to seed potato growers, who cultivate them for another two to three years before selling them to commercial potato producers.

The initial steps are the most specialized and expensive, with limited capacity due to space constraints in Uihlein Farm greenhouses. When Perry learned about an aeroponic system developed by researchers at the International Potato Center in Lima, Peru, he saw potential to free up space, increase efficiency and boost production, so he and Nobles set out to build their own prototype.

The materials list was inexpensive: a large slab of wood, a container to hold solution, piping, a pump, timers and a piece of plastic to create a dark, enclosed chamber. Potato plants grow with their tuber-producing stems suspended in the chamber. Misted regularly with a nutrient solution that is recycled, the plants have thrived, producing dozens of mini tubers over the course of 70 to 90 days, which are handpicked once they grow to the size of a quarter.

This stimulates new tuber growth, with a final yield of up to 5 pounds per plant – 10 times that of potted plants. It also ramps up production of new potato varieties in the first year and gets them planted in the field quicker.

“We will be able to get growers more of what growers want, in a shorter turnaround time,” Perry said. “We will be able to get new varieties into the marketplace faster.”

A recent $47,260 grant from the U.S. Department of Agriculture Specialty Crops Program will enable the researchers to install another chamber – twice the size – next year, then another five the following year. In addition to gains in production, the system will produce savings in materials and labor, Perry said.

“This will allow us to do what we do more efficiently, and help the farm to remain self-sustaining,” Perry added.